Very cool.

Several things:

- there's an airplane icon
- in KML (but not in the UI), you can specify the rotation of an icon, so you can have the plane's heading visualized
- you can extrude icons down to the ground to further demonstrate they're flying at altitude

- you could record the last 5 positions for each plane and show a fading bread crumb

You might guess that I've done a demo like this before, but not with live data.